Due to the bandwidth limitation or change in the call toplogy, such as a media server not supporting SRTP and application of music-on-hold, fallback from SRTP to RTP call is supported.

Upgrade from RTP to SRTP is allowed.

Any conversion from RTP to SRTP between incoming and outgoing legs is applicable after failover.

Media using SRTP flows after failover.

Modification of keys using REINVITE is applicable after failover.

Fallback from RTP to SRTP is applicable after failover.